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trapping the key strokes in Forms

1.) How can i set tooltip property of an item dynamically.
I am using :
" set_item_property('ITEM_NAME',tooltip_text,'AAAA') ". but its not giving desired result.

2.) How can i trap the key strokes while working in a runtime form.
actually my requirement is that i have to scroll certain message along
with the record. the triggers are available (KEY_SCRUP & KEY_SCRDOWN)
but i am not able to find which key user has pressed ( up or down arrow
key). so i just want to trap wether user has pressed up key or down key
so i can fire trigger accrodingly.